Draw in Notes on iPhone
Use the Notes app to draw a sketch or jot a handwritten note with your finger. You can choose from a variety of markup tools and colors and draw straight lines with the ruler.
Draw or use handwriting
In a note, tap , then use the markup tools to draw or write with your finger.
Tip: You can search handwritten text (in supported languages) in Notes. If the note doesn’t have a title, the first line of handwritten text becomes the suggested title. To edit the title, scroll to the top of the note, then tap Edit.
Show lines or grids in notes
In an existing note: Tap , tap Lines & Grids, then choose a style.
Choose the default style for all new notes: Go to Settings > Notes > Lines & Grids.